I have 20 RMC 32/40 cases used for breech seating in my Schuetzen Rifle. Been using them since 1996 when the rifle was built. One case will go about 100 loads with very light loads, one Offhand match, then the breech block gets hard to close. Gets stiff I switch off to the next case. After working through all 20 tried to size them like a normal drawn case. It’s difficult turned brass does not size like drawn.
I chuck them in my lathe take about .002 or less off and they chamber fine. My guess is 12 G turned case being larger diameter would be more difficult to size. Don’t see why you could not do the same, turn just a bit off. They are a lot thicker and stronger than paper or plastic shells.
William
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